JP2002187401A - Balance adjusted wheel, method of manufacturing the same, and method of assembling tire and wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel which need not adjust the balance after having a tire mounted thereon, and a method of assembling the tire and the wheel. SOLUTION: This wheel 1 is balance adjusted in compliance with a tire based on an imbalance amount -g of the light point of the tire 2, a maximum run-out amount +δ and a phase θ in a direction from the light point toward a point of the maximum run-out +δ. And, the wheel 1 is characterized in that: a phase in a direction from the heavy point of the wheel 1 toward the low-point where the radius of the wheel is minimized is set at θ; the radially moving amount of the low-point is set at -δ; and the unbalance amount of the heavy point of the wheel 1 is set at +g.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel of an automobile or the like having a static balance adjusted, a method of manufacturing the same, and a method of assembling a tire and a wheel.

[0002]

2. Description of the Related Art Wheels (tire-wheel assemblies) of automobiles and the like need to balance around the rotation axis and in the direction of the rotation axis in a state where the tire and the wheel are assembled. A state in which the rotation axis is not balanced is called static imbalance. If the static balance is not maintained, vertical vibrations occur during traveling. In addition, a state where the balance in the rotation axis direction is not obtained is called a dynamic imbalance. If the dynamic balance is not obtained, vibrations in up, down, left and right directions are generated, which causes steering shimmy and the like.

[0003] Conventionally, there have been roughly two methods for balancing a tire wheel assembly as follows. One method is to reduce the residual unbalance in the assembled state of the tire and the wheel by assuming that the position of the air valve of the wheel is the emphasis of the static balance of the wheel and by matching it with the light point position of the tire.
The amount of correction balance was reduced. In another method, first, the direction of a radial force variation (RFV), which is a high-strength portion in the radial direction of the tire, and the direction of the low-point low-point in the circumferential direction of the wheel are matched with each other. Build the tires. Then, since the light point which is the lightest direction in the circumferential direction of the tire and the emphasis which is the heaviest direction in the circumferential direction of the wheel usually do not coincide, it is necessary to further add a balance weight. In order to determine the position where the balance weight is added, the assembled tire and wheel assembly is placed on an unbalance measuring instrument, and the direction and amount of the unbalance are measured. The balance is obtained by attaching a balance weight in the direction and the amount to the outer periphery of the side surface of the wheel, and the measurement of the unbalance and the positioning of the balance weight are repeated until the amount of the unbalance becomes a certain amount or less.

[0004]

However, according to the conventional method of aligning the light point of the tire with the air valve, the valve mounting position of the wheel does not always become an important point of the static imbalance. Correction is required, and there is no correlation between static imbalance and wheel runout. According to this method,
The vertical run-out cannot be minimized when the tires and wheels are assembled, causing vibration during running.

In the method of matching the minimum position of the wheel runout with the peak position of the RFV of the tire, there is no correlation between the static imbalance and the wheel runout as described above. The balance could not be minimized, and the amount of correction of the static imbalance by the balance weight was large. Therefore, the balance weight was large, and there were problems such as an increase in manufacturing cost and a deterioration in appearance commerciality.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve such a problem, and provides a wheel having a high appearance and commercial quality by minimizing a vertical run-out and also minimizing a static imbalance in an assembled state of a tire and a wheel. The purpose is to do.

[0007]

In order to solve the above-mentioned problems, according to claim 1 of the present invention, the unbalance amount at the light point of the tire -g, the maximum radial runout amount + δ, and the radial runout amount from the light point. The phase of the wheel is adjusted in accordance with the tire based on the three data of the phase θ in the direction of + δ, and the phase from the point of importance of the wheel toward the low point where the radius of the wheel is minimized. θ, the vertical swing amount of the low point is −δ, and the unbalance amount of the emphasis is + g. Further, in claim 2 of the present invention,
A balanced wheel according to claim 1;
An assembling method for assembling the tire, wherein the light point and the important point are combined so as to have the same phase.

According to such a method of assembling a wheel and a tire with a wheel, the tire is assembled in such a manner that the light point of the tire is adjusted to the weight of the wheel, so that the light point unbalance amount -g and the weight unbalance amount + G is canceled out, and the static imbalance is almost eliminated. In addition, the radial runout amount + δ of the tire at a position shifted by θ from the light point and the vertical deflection amount -δ of the low point of the wheel at a position shifted by θ from the important point have the same phase and cancel each other. Therefore, the vertical runout of the entire tire and wheel is reduced. Therefore, even if the static balance is not adjusted by the balance weight later, the static unbalance can be minimized while the vertical runout is minimized in the assembled state of the tire and the wheel. Note that the point of importance of the wheel is + g when the point of importance is + g when the air valve is mounted. In addition, quantities such as + g, -g and + δ, -δ are
It is not necessary that they exactly match, and they may be slightly different as long as they are satisfactory in terms of merchantability.

According to a third aspect of the present invention, there are three imbalance amounts at the light point of the tire -g, the maximum radial runout amount + δ, and the phase θ from the light point toward the radial runout amount + δ. A method of manufacturing a wheel whose balance is adjusted in accordance with the tire based on data, wherein after measuring a low point, the emphasis of an unbalance amount of + g in a direction shifted in phase from the measured low point by −θ. It is characterized by performing a lightening process so that is positioned. According to the wheel obtained by such a manufacturing method, by assembling the light point of the tire and the emphasis of the wheel, the unbalance amount -g of the light point,
The imbalance amount + g of the emphasis is mutually offset, and the static imbalance is almost eliminated. In addition, the maximum position of the radial runout of the tire at a position shifted by θ from the light point and the low point of the wheel at a position shifted by θ from the point of importance have the same phase and cancel each other out. Vertical runout is reduced. Therefore, even if the static balance is not adjusted by the balance weight later, the static unbalance can be minimized while the vertical runout is minimized in the assembled state of the tire and the wheel.

According to a fourth aspect of the present invention, the three points of the unbalance amount -g at the light point of the tire, the maximum radial runout amount + δ, and the phase θ from the light point toward the radial runout amount + δ. A method for manufacturing a wheel, the balance of which is adjusted in accordance with the tire based on the data, after cutting the outer periphery of the wheel by eccentricity so that the vertical runout of the low point of the wheel is −δ,
The method is characterized in that lightening is performed so that the emphasis of + g imbalance is in the direction in which the low point and the phase are shifted by −θ. According to the wheel obtained by such a manufacturing method, it is possible to provide a wheel having a low point of the vertical runout amount corresponding to the vertical runout of the tire, and it becomes unnecessary to measure the low point of the wheel. Then, by assembling the light point of the tire and the emphasis of the wheel together, the imbalance amount -g of the light point and the imbalance amount + g of the emphasis are mutually offset, and the static imbalance is almost eliminated. In addition, the radial runout amount + δ of the tire at a position shifted by θ from the light point and the vertical deflection amount -δ of the low point of the wheel at a position shifted by θ from the important point have the same phase and cancel each other. Therefore, the vertical runout of the entire tire and wheel is reduced. Therefore, even if the static balance is not adjusted by the balance weight later, the static unbalance can be minimized while the vertical runout is minimized in the assembled state of the tire and the wheel.

According to a fifth aspect of the present invention, in the method for manufacturing a wheel with the balance adjusted according to the third or fourth aspect, the air valve mounting hole is shifted in the direction shifted by -θ from the low point. It was characterized by piercing. According to the wheel obtained by such a manufacturing method, since the direction of the air valve mounting hole is the important point of the wheel, the tire and wheel assembling worker can use the air valve as the emphasis mark and the light point of the air valve and the tire. By simply assembling together, it is possible to eliminate static imbalance in the assembled state of the tire and the wheel, and the maximum position of the radial runout and the low point of the wheel are also in the same phase and cancel each other, so the tire While minimizing vertical run-out while assembling the wheel and static imbalance

In the claims, the phase means an angle formed by two directions from a center of a tire or a wheel toward two predetermined positions such as a circumference and a side surface of the tire or a wheel. Further, in the claims 3 to 5, the expression "+ g imbalance amount" means that the amount of the imbalance is + g when the air valve is mounted on the wheel. Also, since the radial runout of the tire and the phase of the primary peak of the radial force variation (RFV) have a high correlation, it is necessary to manufacture the wheel using the maximum position of the radial runout as a guide and to determine the primary position of the RFV. Performing the manufacturing method according to any one of claims 3 to 5 using the position of the peak as a mark is the same.

[0013]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a balanced wheel of the present invention, and FIG.
FIG. 2 is a sectional view taken along line XX in FIG. 1. As shown in FIG. 1, the wheel 1 is made of a light alloy such as an aluminum alloy, and is assembled with a disc-shaped disk portion 6 having a center hole 5 as a center portion for fixing the hub to a hub, and a tire 2. And a substantially cylindrical rim portion 7 for the purpose. In the present embodiment, the wheel 1 is described as being integrally manufactured from a light alloy.
The disk portion 6 and the rim portion 7 may be separate bodies (two pieces) or may be applied to a case of three pieces. Also,
The wheel 1 can be made of other materials such as stainless steel.

The disk portion 6 has a bolt insertion hole 12 formed near the center hole 5 for inserting a bolt of a hub and fastening with a nut. Further, a plurality of cooling holes 13 are formed in the peripheral portion 6 a of the disk portion 6 (see FIG. 2) so as to surround the center hole 5. The cooling hole 13 is a hole for releasing frictional heat generated by a disk brake provided adjacent to the hub and for taking in outside air for cooling, and is also appropriately opened as a decoration.

The rim 7 has a substantially cylindrical shape having an inner peripheral surface 7a and an outer peripheral surface 7b. Both ends of the outer peripheral surface 7b are erected to form rim flanges 8,8. The bead portion of the tire 2 is fitted to the rim flanges 8, 8 and the bead seat portions 9, 9 inside the rim flanges 8, 8, and the wheel 1
When the tire 2 is assembled to the tire, a tire wheel assembly 3 is obtained. Further, an air valve mounting hole 10 for mounting an air valve for introducing compressed air for inflating the tire 2 is opened on the disk portion 6 side of the rim portion 7.
The bead seat portions 9 and 9 are slightly eccentric upward in FIG. 2 with respect to the center hole 5 where the hub and the center are aligned. Therefore, the thickness of the lower bead seat portions 9 and 9 in FIG. , Thinner that much.

FIG. 3 is a side view of the tire. Tire 2
When rolling, there is a run-out due to a dimensional change caused by a manufacturing error. Of these dimensional changes, the run-out in the vertical direction (radial direction) of the tire 2 is generally called a radial run-out. Causes of this run-out include a case where the height from the inner diameter portion 2a of the tire to the tread surface 2b is partially different, a case where the thickness of the tread portion is partially different, and the like. As shown in FIG. 3, the tread surface 2b corresponding to the outer periphery of the tire starts from the inner diameter portion 2a of the tire fitted with the rim portion 7.
When the distance (the height of the tire) changes to the portion where the distance is the smallest, the size of the larger portion is defined as the radial runout amount.

The tire 2 generates vibrations in the longitudinal direction when rolling, mainly due to the radial runout. By combining a standard wheel manufactured with high roundness and the tire 2, the reaction force generated by the tire in the radial direction with respect to the contact surface is called a radial force variation (RFV). This RFV peak is displayed as an RFV peak mark 21. As described above, since the RFV is mainly caused by the radial runout, the peak position of the RFV usually coincides with the peak position of the radial runout amount.

Further, the tire 2 has a difference in weight distribution due to a manufacturing error, and the balance is measured for each tire. As a result, the light point mark 22 is located at the lightest point in the lightest direction of the tire 2. Is displayed.

Therefore, the tire 2 has a light point position and a light point imbalance amount -g, an RFV position (a position where the radial runout amount is the maximum), a radial runout amount + δ, and a phase from the light point toward the RFV. is known as a result of the measurement.

Next, a method of manufacturing the wheel 1 will be described. When manufacturing the wheel of the present invention in which the balance is adjusted, the balance is adjusted as described below using the three data of the unbalance amount -g, the radial runout amount + δ, and the phase θ of the light point. To manufacture.

FIG. 4 (a) is a perspective view of a processing machine for machining a shaped material, and FIG. 4 (b) is a partially enlarged side sectional view of the processing machine when manufacturing a wheel 1. Has a casting,
Forging, drawing or the like is performed on the shaped material close to the final shape of the disk portion 6 and the rim portion 7 to perform dimensioning by performing machining or the like. Machine processing for dimensioning each part of the wheel 1 is performed by fixing the shaped material 1a to a chuck 31 of a processing machine 30 as shown in FIGS.
This is performed by rotating the chuck 31 together with the chuck 31 and bringing a processing tool 32 having a predetermined cutting tool into contact with the workpiece 1a to trace a desired shape. The chuck 31 has a tapered cone 33 fitted at the center thereof for fitting with the center hole 5 of the cast material 1a, and a circumferential portion for fixing a fixing margin 8a extending from the rim flange 8 of the cast material 1a. Are fixedly arranged. Note that the chuck 31 is not limited to the shape shown in FIG. 4A, but may be an arbitrary one such as a stroke type chuck or a collet chuck. The processing machine 30 may be a horizontal processing machine.

In the present embodiment, as shown in FIG. 4 (b), the tapered cone is formed so that the center axis C of the cast material 1a is located below the rotation center axis DC of the chuck 31 by a distance δ / 2. 33 is shifted. In this state, the center hole 5 of the base material 1a is fitted into the tapered cone 33, and the fixing allowance 8a extending from the rim flange 8 of the base material 1a.
Is fixed by three fixing portions 34. And the chuck 31
Is rotated about the central axis DC in FIG. 4B as a rotation axis, and the bead seat portions 9 are cut. As a result, the bead seat portions 9 are eccentric with respect to the center of the tapered cone 33 of the shaped material 1a, and a radial runout and a low point of + δ at the maximum are generated.

Next, the air valve mounting hole 10 is pierced from the outer peripheral side of the rim portion 7 to a portion shifted in phase by -θ from the low point while being fixed to the chuck 31. And
Lightening is performed so that the amount of imbalance becomes + g in the direction of the air valve mounting hole 10 that is out of phase from the low point by −θ.

FIG. 5 is a side view for explaining imbalance of the wheel 1. FIG. The position at which the lightening process is performed and the lightening amount are determined by calculation from the respective amounts of δ, g, and θ as follows. Note that θ is calculated assuming that the clockwise direction is positive. First,
Move the bead seat parts 9 and 9 of the rim from the center of the wheel 1 by δ.
By performing the cutting process with the eccentricity of / 2, the vector v1 becomes unbalanced in the direction opposite to the low point direction. In the description here, the vector indicates the direction and amount of imbalance. Further, by providing the air valve mounting hole 10, when the air valve is mounted, an imbalance of only the vector v4 occurs in the direction of the air valve mounting hole 10. Then, if an imbalance of + g occurs in a direction shifted from the low point by the phase −θ, the imbalance can be canceled out when combined with the tire 2, so that an unbalanced vector v3 that is insufficient in this direction is calculated. When the vector v2 is obtained by combining the vector v1 and the vector v3, the lightening may be performed in a direction opposite to the vector v2 so as to cause an imbalance corresponding to the magnitude of the vector v2.

When the phase and amount of lightening are determined as described above, the chuck 31 is rotated to match the processing tool with the phase. Then, by using a processing tool such as a drill, the waste meat 7c remaining on the inner periphery of the rim 7 (FIG. 4)
(Refer to (b))), the imbalance is generated by generating an imbalance corresponding to the vector v2.

In the wheel 1 thus obtained, a point of + g is generated upward in FIG.
A low point of the vertical swing amount −δ is generated in the direction advanced by the distance. In addition, since the lightening process is performed so that the direction of the point of focus matches the position of the air valve, the position of the air valve always becomes the point of importance.

When assembling the wheel 1 and the tire 2, the air valve of the wheel 1 and the light spot mark 22 of the tire 2 are assembled together. Then, the low point of the wheel 1 and the positions of the radial runout peak and the RFV peak of the tire 2 also match. That is, the weight + g of the wheel 1 and the light point -g of the tire 2 are offset each other,
The vertical runout -δ of the wheel 1 and the radial runout + δ of the tire 2 also cancel each other. Therefore, if the operator or the assembling apparatus assembles the position of the air valve of the wheel 1 and the light mark 10 of the tire 2, the vertical deflection of the entire wheel is minimized without correcting the balance with the balance weight thereafter. And the wheels can be statically balanced.

In the above-described embodiment, the eccentric processing is performed at the time of finishing the bead seat portions 9 and 9 to intentionally generate the low point vertical runout −δ.
When using the finished wheel 1
The air valve is measured in the same manner as in the above-described manufacturing method so that the vertical deflection of the bead seat portions 9 and 9 of the wheel 1 is measured to determine the low point position of the wheel 1 and the point of importance + g is generated at a position -θ from the low point position. The mounting hole and the lightening hole may be machined. If the tire-wheel assembly is assembled by aligning the air valve of the wheel 1 manufactured in this way with the light mark 22 of the tire 2, the vertical run-out of the entire tire-wheel assembly can be minimized even for a wheel that has already been finished. In addition, a tire wheel assembly with a static balance can be obtained.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, the processing of lightening is not limited to drilling, but any method that can control the position and amount of lightening can be used with laser, water,
It can be processed by various methods such as processing by electric discharge. Further, even if the position of the air valve is not necessarily emphasized, if the position of the emphasis is marked so as to be recognized, a position unrelated to the air valve can be emphasized.

[0030]

As described above in detail, according to the present invention, the following remarkable effects can be obtained. According to the method for assembling the wheel and the wheel according to the first and second aspects of the present invention, the vertical running of the entire tire-wheel assembly can be minimized by the simple operation of assembling the tire with the light point of the tire and the focus of the wheel. In addition, the static imbalance can be minimized, and the occurrence of vibration when rolling the wheels can be suppressed. Therefore, since the correction by the balance weight is not required, it is possible to reduce the cost of parts and assembly and to improve the appearance and commercial value. Further, according to the method for manufacturing a balanced wheel according to the third aspect of the present invention, it is possible to manufacture a wheel capable of canceling out vertical runout and static imbalance according to the manufacturing error of each tire. Furthermore, according to the method of manufacturing a wheel with the balance adjusted according to the fourth aspect, a wheel having a low point -δ in accordance with the radial runout amount + δ of each tire can be used, so that the wheel can further cancel the vertical runout. Can be manufactured. Further, according to the method for manufacturing a balanced wheel according to claim 5 of the present invention, it is possible to manufacture a wheel in which the direction of the air valve is always important, and for a tire and wheel assembler or assembling apparatus, The mark can be used as a mark for phase adjustment, and work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a balanced wheel of the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

FIG. 3 is a side view of the tire.

FIG. 4A is a perspective view of a processing machine for machining a shaped material, and FIG. 4B is a partially enlarged side sectional view of the processing machine.

FIG. 5 is a side view of the wheel.

[Description of Signs] 1 wheel 2 tire 3 tire wheel assembly 5 center hole 6 disk part 7 rim part 8 rim flange 10 air valve mounting hole 21 RFV peak mark 22 light point mark

Continued on the front page (72) Inventor Hisamitsu Takagi 1-4-1 Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Inventor Shinichi Watanabe 1-1-10-1, Shinsayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (72) Inventor Hidemi Ichinose 1907 Hiratacho, Suzuka City, Mie Prefecture Honda Motor Co., Ltd.

Claims (5)

[Claims] 1. A tire light point unbalance amount -g, a maximum radial runout amount + δ, and a phase θ from the light point toward the radial runout amount + δ in accordance with the tire according to the tire. The phase of the wheel adjusted in balance, from the point of importance of the wheel toward the low point where the radius of the wheel is minimum is θ, the amount of vertical deflection of the low point is −δ, and A wheel whose balance has been adjusted, wherein the unbalance amount of the wheel is + g. 2. The method of assembling a tire and a wheel according to claim 1, wherein the wheel with the balance adjusted and the tire are combined so that the light point and the emphasis are in the same phase. . 3. An unbalance amount at a light point of the tire -g, a maximum radial runout amount + δ, and a phase θ from the light point toward the radial runout amount + δ in accordance with the data of the tire. This is a method for manufacturing a wheel in which the balance is adjusted. After measuring the low point, the lightening is performed so that the emphasis of the + g unbalance amount is located in the direction in which the phase is shifted from the measured low point by −θ. A method for producing a wheel with an adjusted balance, characterized by processing. 4. The tire is adapted to the tire based on three data: the unbalance amount at the light point of the tire -g, the maximum radial runout amount + δ, and the phase θ from the light point toward the radial runout amount + δ. A method of manufacturing a wheel in which the balance is adjusted, wherein after cutting the outer periphery of the wheel by eccentricity so that the vertical runout amount of the low point of the wheel is −δ, the low point and the phase are −
A method for manufacturing a balanced wheel, characterized in that a lightening process is performed so that the emphasis of + g imbalance comes in a direction shifted by θ. 5. The method for manufacturing a wheel according to claim 3, wherein an air valve mounting hole is formed in a direction in which the phase is shifted by −θ from the low point. Production method of the wheel with the adjustment.